[Webkit-unassigned] [Bug 193903] New: [GTK] gdk_cairo_draw_from_gl() in AcceleratedBackingStoreWayland fails in GtkInspector's magnifier

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=193903

            Bug ID: 193903
           Summary: [GTK] gdk_cairo_draw_from_gl() in
                    AcceleratedBackingStoreWayland fails in GtkInspector's
                    magnifier
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: exalm7659 at gmail.com
                CC: bugs-noreply at webkitgtk.org

Created attachment 360336

  --> https://bugs.webkit.org/attachment.cgi?id=360336&action=review

WebkitWebView in magnifier

AcceleratedBackingStoreWayland uses gdk_cairo_draw_from_gl() for drawing on GTK+ 3.16.0+. For some reason, in GtkInspector's magnifier or when drawing into a non-default Cairo surface, it doesn't draw anything and generates GL_INVALID_OPERATION (when I manually add glGetError() checks, by default it doesn't print anything.

See attached screenshot

Fedora 29, Intel GPU, Wayland, org.gnome.Platform//master in Flatpak.

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